Testing device



Nov. 3, 1925.

L. TREUHEIT TESTING DEVICE Filed June 23. 1924 Patented Nov. 3, 1925.

UNITED STATES PATENT OFFICE.

LEONHARSD TREUHEIT, or ELBERFELD, GERMANY.

TESTING DEVICE.

Application filed .Tune 23,

taining the compression strength of granular substances and moreespecially the consolidation of sand, composition and loam moulds.

As is well known to those skilled in the art, the consolidation ofmoulds and cores is an important factor in foundry practice as itinfluences to a great extent the quality of castings obtained. If thematerial is too .strongly compressed, it lacks porosity and the gasescannot escape. If it is too loose, the moulds are expanded and theweight of castings is unduly increased.

By examining the consolidation of the moulds and rejecting such as aretoo compact or too loose, defective castings can be avoided.

It is an object of my invention to provide a simple and reliable testingdevice for the purpose specified.

In the drawings afiixed to this specification and forming part thereof,two devices embodying my invention are illustrated diagrammatically byway of example. In the drawings- Fig. 1 is a longitudinal section of avertical tester and Fig. 2 is an elevation partly in section of ahorizontal tester. v

The vertical tester shown in Fig. l com-- prises a hollow cylinder ahaving the form of a tubular handle, a hollow slide or piston breciprocating therein, a' cap g with a central opening at the bottom ofthe cylinder and a measuring dial and pointer e connected with thepiston b by a pin d. A hardened steel ball 0 is seated in the lower endof the piston b, and the piston is weighted by shot or the like f.

The horizontal tester, Fig. 2, is of similar construction but has anangular cylinder. The steel ball is secured in a piston lo which isguided in the horizontal portion i and connected with the hollow pistonb in the vertical portion of the cylinder by a bell crank lever mpivoted at Z and links m', m.

Means are further provided for drawing the ball .d into the cylinder z'and locking 1924. serial N o. 'masa' the piston when the implement isnot in use. To this` end a sleeve n comprising a cam face o is placed onthe upper end of the cylinder which is slotted at p and a pin gprojecting from the slot and secured in the pis` ton Z) rests on the camsurface 0.

When the sleeve nis turned to the left in Fig. 2, the pin q is raised,carrying the piston b along and vdrawing the ball c into rthe cylinderz' through the medium of the bell- 3 crank lever m.

The operationvof the novel device1s,as

The bottom of the handle is placed on the' mould, core, etc. to betested and the piston b is released by turning the sleeve o. The ball owill then make an impression in the mould whose depth is determined bythe weight of the piston and the consolidation of the mould andindicated by the dial e.

The compression strength may be calculated by dividing the load on theball by the surface of the impression whose depth is indicated by thedial el. Preferably a table is secured on the outside of the cylinder aon which the compression strength corresponding to the depth ofimpression may be read directly.

The tensile strength of sand, etc., is a function of its compressionstrength so that the tensile strength may be calculated from the dialindications and tabulated as described. l

Moulds, cores etc. can thus be tested without any loss of time, avertical or horizontal testing device being used in accordance with theposition of the surfaces to be tested.

I wish it to be understood that I do not desire to be limited t0 theexa-ct details of construction shown and described, for obviousmodifications will occur to a person skilled in the art.

I claim 1. Testing device for ascertaining the compression strength ofgranular substances comprising a tubular handle,` a slide adapted toreciprocate in said tubular handle and provided at one end with acontact surface for engaging a test piece and means on the other end ofsaid handle for indicating the travel of said slide and an operativeconnection between said slide and said indicating means. f

2. Testing device forv ascertaining the compression strength of granularsubstances lOO llO

comprising a cylindrical handle, a pistonlike slide adapted toreciprocate in said handle, a ball secured to one end of said slide andmea-ns on said handle for indicating the stroke of said slide.

3. Testing device for ascertaining the compression strength or' granularsubstances comprising a cylindrical handle, a hollow piston-like slideadapted to reciprocate in said handle, weighting means in said handle, aball secured to one end of said slide land means on the other end ofsaid handle for indicating the stroke of said slide.

4. Testing device for ascertaining the compression strength of granularsubstances comprising an angular tubular handle, two slides operativelyconnected with each other and arranged for reciprocation in differentparts of said tubular handle, a ball secured to one of said slides andmeans on said handle for indicating the travel of said slides.

5. Testing device for ascertaining the compression strength of granularsubstances comprising a cylindrical shell, a piston-like slide adaptedto` reciprocate in saidr handle, a hall secured to one end of saidslide, means on said handle for indicating the stroke of said slide, asleeve rotatably carried on said handle, a cam face on said sleeve and apin secured to said slide and adapted to cooperatel with said` cam face.

6. Testing device for ascertaining the compression strength of granularsubstances comprising an angular tubular handle, two slides operativelyconnected with eachother and arranged for reciprocation in dilerentparts of said handle, a hall secured to one of.

said slides, means on said handle for indicating the travel of saidslides and means 'for locking one of said pistons in said handle.

In testimony whereoltl I afiX' my signature.

LEONHARD TREUHE-IT.

